#!/usr/bin/env bash
# next/tests/flow_dispatch.sh — fed-sx triggers Phase 3.
#
# flow_dispatch bridges a matched trigger to a started flow — a native
# flow_store:start (the engine is Erlang-on-SX too, no FFI). Confirms
# guard/actor-scope gating, the audit triple, synchronous first-step
# execution, suspend/resume of a started instance, a branch on an
# activity field, and graceful handling of an unknown flow name.

set -uo pipefail
cd "$(git rev-parse --show-toplevel)"

SX_SERVER="${SX_SERVER:-hosts/ocaml/_build/default/bin/sx_server.exe}"
if [ ! -x "$SX_SERVER" ]; then
  SX_SERVER="/root/rose-ash/hosts/ocaml/_build/default/bin/sx_server.exe"
fi
if [ ! -x "$SX_SERVER" ]; then
  echo "ERROR: sx_server.exe not found." >&2
  exit 1
fi

VERBOSE="${1:-}"
PASS=0; FAIL=0; ERRORS=""
TMPFILE=$(mktemp); trap "rm -f $TMPFILE" EXIT

# Activity (Create of a Note by alice), receiving actor-state, and a
# couple of flows: `capture` echoes the activity's type out of the
# flow's input env; `wait_flow` suspends then wraps the resumed value;
# `cat_flow` branches on the inner object's :type.
ACT='[{type, create}, {actor, alice}, {id, <<97,99,105,100>>}, {object, [{type, note}]}]'
AS='[{actor_id, alice}]'
CAP='flow_spec:flow_node(fun(In) -> {ok, A} = envelope:get_field(activity, In), {ok, T} = envelope:get_field(type, A), T end)'
WAITF='flow_spec:sequence([flow:suspend(w), flow_spec:flow_node(fun(V) -> {got, V} end)])'
CATF='flow_spec:branch(fun(In) -> {ok, A} = envelope:get_field(activity, In), {ok, O} = envelope:get_field(object, A), envelope:get_field(type, O) =:= {ok, note} end, flow_spec:flow_const(is_note), flow_spec:flow_const(not_note))'

cat > "$TMPFILE" <<EPOCHS
(epoch 1)
(load "lib/erlang/tokenizer.sx")
(load "lib/erlang/parser.sx")
(load "lib/erlang/parser-core.sx")
(load "lib/erlang/parser-expr.sx")
(load "lib/erlang/parser-module.sx")
(load "lib/erlang/transpile.sx")
(load "lib/erlang/runtime.sx")
(load "lib/erlang/vm/dispatcher.sx")
(epoch 2)
(eval "(er-load-gen-server!)")
(eval "(get (erlang-load-module (file-read \"next/kernel/envelope.erl\")) :name)")
(eval "(get (erlang-load-module (file-read \"next/flow/flow.erl\")) :name)")
(eval "(get (erlang-load-module (file-read \"next/flow/flow_spec.erl\")) :name)")
(eval "(get (erlang-load-module (file-read \"next/flow/flow_store.erl\")) :name)")
(eval "(get (erlang-load-module (file-read \"next/kernel/trigger_registry.erl\")) :name)")
(epoch 3)
(eval "(get (erlang-load-module (file-read \"next/kernel/flow_dispatch.erl\")) :name)")

;; ── guard / actor-scope gating ─────────────────────────────
(epoch 10)
(eval "(get (erlang-eval-ast \"flow_dispatch:guard_passes(trigger_registry:mk_spec(c, f, undefined, any), ${ACT}, ${AS})\") :name)")
(epoch 11)
(eval "(get (erlang-eval-ast \"flow_dispatch:guard_passes(trigger_registry:mk_spec(c, f, fun(_, _) -> false end, any), ${ACT}, ${AS}) =:= false\") :name)")
(epoch 12)
(eval "(get (erlang-eval-ast \"flow_dispatch:guard_passes(trigger_registry:mk_spec(c, f, fun(A, _) -> envelope:get_field(actor, A) =:= {ok, alice} end, any), ${ACT}, ${AS})\") :name)")
(epoch 13)
(eval "(get (erlang-eval-ast \"flow_dispatch:guard_passes(trigger_registry:mk_spec(c, f, undefined, alice), ${ACT}, ${AS})\") :name)")
(epoch 14)
(eval "(get (erlang-eval-ast \"flow_dispatch:guard_passes(trigger_registry:mk_spec(c, f, undefined, bob), ${ACT}, ${AS}) =:= false\") :name)")

;; ── start: audit triple + synchronous first step ───────────
(epoch 20)
(eval "(get (erlang-eval-ast \"flow_store:start_link(), flow_store:register_flow(capture, ${CAP}), flow_dispatch:start(trigger_registry:mk_spec(<<116,99>>, capture, undefined, any), ${ACT}, ${AS}, []) =:= {ok, 1, {<<97,99,105,100>>, <<116,99>>, 1}}\") :name)")
(epoch 21)
(eval "(get (erlang-eval-ast \"flow_store:start_link(), flow_store:register_flow(capture, ${CAP}), {ok, FlowId, _} = flow_dispatch:start(trigger_registry:mk_spec(<<116,99>>, capture, undefined, any), ${ACT}, ${AS}, []), flow_store:status(FlowId) =:= {ok, {done, create}}\") :name)")

;; ── unknown flow name -> {error, no_such_flow}, no crash ────
(epoch 30)
(eval "(get (erlang-eval-ast \"flow_store:start_link(), flow_dispatch:start(trigger_registry:mk_spec(<<116,99>>, ghostflow, undefined, any), ${ACT}, ${AS}, []) =:= {error, no_such_flow}\") :name)")

;; ── started instance suspends; resume completes ────────────
(epoch 40)
(eval "(get (erlang-eval-ast \"flow_store:start_link(), flow_store:register_flow(wait_flow, ${WAITF}), {ok, FlowId, _} = flow_dispatch:start(trigger_registry:mk_spec(<<116,99>>, wait_flow, undefined, any), ${ACT}, ${AS}, []), S1 = flow_store:status(FlowId), R = flow_store:resume(FlowId, 7), S1 =:= {ok, {suspended, w}} andalso R =:= {ok, {flow_done, {got, 7}}}\") :name)")

;; ── branch on an activity field (both branches) ────────────
(epoch 50)
(eval "(get (erlang-eval-ast \"flow_store:start_link(), flow_store:register_flow(cat_flow, ${CATF}), {ok, FlowId, _} = flow_dispatch:start(trigger_registry:mk_spec(<<116,99>>, cat_flow, undefined, any), ${ACT}, ${AS}, []), flow_store:status(FlowId) =:= {ok, {done, is_note}}\") :name)")
(epoch 51)
(eval "(get (erlang-eval-ast \"flow_store:start_link(), flow_store:register_flow(cat_flow, ${CATF}), {ok, FlowId, _} = flow_dispatch:start(trigger_registry:mk_spec(<<116,99>>, cat_flow, undefined, any), [{type, create}, {actor, alice}, {id, <<120>>}, {object, [{type, article}]}], ${AS}, []), flow_store:status(FlowId) =:= {ok, {done, not_note}}\") :name)")
EPOCHS

OUTPUT=$(timeout 360 "$SX_SERVER" < "$TMPFILE" 2>/dev/null)

check() {
  local epoch="$1" desc="$2" expected="$3"
  local actual
  actual=$(echo "$OUTPUT" | awk -v e="$epoch" '
    $0 ~ "^\\(ok-len " e " " { getline; print; exit }
    $0 ~ "^\\(ok " e " "     { print; exit }
    $0 ~ "^\\(error " e " "  { print; exit }
  ')
  [ -z "$actual" ] && actual="<no output for epoch $epoch>"
  if echo "$actual" | grep -qF -- "$expected"; then
    PASS=$((PASS+1))
    [ "$VERBOSE" = "-v" ] && echo "  ok $desc"
  else
    FAIL=$((FAIL+1))
    ERRORS+="  FAIL [$desc] (epoch $epoch) expected: $expected | actual: $actual
"
  fi
}

check  3 "flow_dispatch module loaded"      "flow_dispatch"
check 10 "undefined guard + any scope pass" "true"
check 11 "guard false -> no pass"           "true"
check 12 "guard true on activity field"     "true"
check 13 "actor-scope match passes"         "true"
check 14 "actor-scope mismatch fails"       "true"
check 20 "start returns audit triple"       "true"
check 21 "first step runs synchronously"    "true"
check 30 "unknown flow -> no_such_flow"     "true"
check 40 "started flow suspends + resumes"   "true"
check 50 "branch then-arm (is_note)"        "true"
check 51 "branch else-arm (not_note)"       "true"

TOTAL=$((PASS+FAIL))
if [ $FAIL -eq 0 ]; then
  echo "ok $PASS/$TOTAL next/tests/flow_dispatch.sh passed"
else
  echo "FAIL $PASS/$TOTAL passed, $FAIL failed:"
  echo "$ERRORS"
fi
[ $FAIL -eq 0 ]